If you consider yourself to be an early adopter then you might be interested in the Beta Twitter-JAJAH application which allows you to make free two minutes calls (the verbal equivalent of a tweet) to other Twitter users without giving your telephone number away.

You only need to tweet “@call @twittername” and where “twittername” is, type the Twitter name of the person you wish to call. Your phone will then ring and the call is connected. Of course, the other person must be a member of JAJAH for it to work!

BETA invitations have already been sent to selected Twitter accounts. If you’re fortunate to have received one, it will show up under “My Services” / “My Account” / “Twitter Calls.” And if not then you can email them to request an invitation twitter@jajah.com